JPS6110422Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a fire protection device for cable ducts, and more particularly to a fire protection device for cable ducts that has fireproof properties and also has water-blocking properties even if water intrudes into the cable ducts.

When a fire breaks out, large amounts of water are sprayed onto the fire site from installed sprinklers and fire trucks.
If a cable duct was installed at the scene of such a fire, water could run through the duct to a switchboard or operation panel located far away from the fire scene, causing severe damage to the electrical system. On the other hand, since there is a risk of fire spreading through such cable ducts through the electric wires installed inside the duct, there is a trend toward installing fireproof partition walls that partition the cable duct in the longitudinal direction at appropriate intervals and locations. Although wall structures have been proposed,
In both cases, the need to prevent water from running through the cable duct is overlooked. Therefore, the inventors of the present invention have proposed several water-impermeable fireproof partition walls that take into account the water-impervious properties described above. A problem arose in that water accumulated above the water-blocking fireproof partition wall, and the partition wall eventually fell off due to water pressure.

The present invention provides an improved water-impermeable fire protection device for cable ducts devised based on the above-mentioned findings, in which electric wires are installed and cable ducts laid vertically or diagonally are made into water-impermeable fire-prevention devices. The cable duct is characterized in that it is partitioned by a partition wall and that a drainage port is provided near the end face above the partition wall of the cable duct. The invention will be explained below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of a water-blocking fire protection device for cable ducts according to the present invention. In the figure, 1 is a cable duct, 2 is a multi-strand electric wire, 3 is a waterproof fireproof partition wall, and 4 is a lid for the cable duct. Reference numeral 11 denotes a drainage port provided near the upper end face 30 of the partition wall 3 of the cable duct. Of course, there may be one or more drain ports. It may be provided at either the bottom or side wall of the cable duct, or may be provided at the lid 4 in some cases. The water-blocking fireproof partition wall 3 is configured as follows, for example. That is, after forming a foamable fireproofing putty layer 31, which is a waterproof fireproofing material, on the inner wall of the cable duct 1, each of the multi-strand electric wires 2 is wrapped with a foaming sheet 32, and then the foamed fireproofing putty layer 31 is formed on the inner wall of the cable duct 1. 31, and then close the space between the upper part of the multi-strand electric wire and the inner wall of the cable duct with a wall 33 of foamed fireproofing putty, which is a waterproof fireproofing material, to form a dam. A room temperature curing type fireproof sealant 34 is injected into the upper part and hardened. In the case of multi-strand electric wires, in order to prevent water from running through the gaps between each wire, a dam is formed as described above and a fireproof sealant is injected and solidified, but if the number of wire cores is small, foaming fireproofing is used. The water-impermeable fireproof partition wall 3 may be formed only with putty. As the foamable fireproof putty and fireproof sealant, for example, "DF Putty A" and "DF Seal" (both trade names of Dainichi Nippon Electric Cable) can be used.

As mentioned above, in the water-shielding fire protection device for cable ducts according to the present invention, the drainage port is provided near the upper end of the water-shielding fire-proof partition wall, so that water can be drained through cable ducts laid vertically or diagonally. Even if the water reaches the water-based fire prevention partition wall, the water is drained from the drain port, so that water does not accumulate in the partition wall. Therefore, there is no risk that the fireproof partition wall will fall off due to the pressure of water accumulated above the partition wall.
Even in the event of a fire, the water-impermeability and fireproof properties of the partition wall can be sufficiently guaranteed. Additionally, as a means to prevent the partition wall from falling off, it is generally considered that a member that supports the partition wall from below is fixedly installed inside the cable duct, but compared to this, the present invention uses an extremely simple structure in which a drainage port is opened in the cable duct. It can prevent falling off and has high practical value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a water-blocking fire protection device for cable ducts according to the present invention. In the figure, 1...cable duct, 2...multi-strand electric wire, 3
...Waterproof fireproof partition wall, 4...Lid, 11...Drain port.

Claims (1)

[Scope of utility model registration request] A cable duct in which electric wires are disposed and laid vertically or diagonally is partitioned by a waterproof fireproof partition wall, and a drainage port is provided near the upper end of the partition wall of the cable duct. Waterproof fire protection device for cable ducts.